Improvement in fruit-jars



i UNITED A'STATES lJOHN L. MAsON, OE NEW YOEH, Nr.y

IMPROVEMENT IN FRUIT-JARS.

Specification forming part of Letters Patent No. 100,306, dated March l, 1870.

To all whom/.it may concern:

Be it known that I, JOHN L. MASON, of th city and county of New York, and State of INew York,'have invented a new and Improved Mode of Sealing Preserve-J ars 5 and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanyingdrawings, making part of this specification, in Which- Figure l is a diametrical section through the upper portion of a perservejar with cover applied, but not forced down upon it. Fig. 2 is an external view of the jar with the cover confined in place. same parts shown in Fig. 1,with the cover confined in place.

Similar letters of referenceindicate corresponding parts -in the several figures.

rIhis invention relates to an improvement on covers for preserve-jars, which have rubber gaskets confined in annular grooves made in external upwardly-tapering su rfaces surroun ding the mouths of the jars.

The nature of my invention and improvement consists in constructing the caps or covers for Such jars with annular steps or. ribs upon the inner surfaces of theiraims, so that when these caps or covers are forced down in their places upon the rubber' gaskets the angles ofthe ribs or steps will embed themselves in the rubber and produce tight joints, as will be hereinafter explained.` l

To enable others skilled in the art to understand my invention, I will describe its construction and operation.

In the accompanying drawings, A represents a preserve-j ar, which is preferably made of glass or other vitreous substance, and which has a screw-thread, q, formed upon it, which terminates upwardly in a shoulder, b, from which rises a rib, d, that surroundsthe mouth of the jar. The external surface of the rib d tapers upwardly, and `has an annular groove, c, formed in it, which receives and confines in place an india-rubber gasket or packing-ring, J, as shown in Figs. 1 and 3.

The screw-thread a is adapted for receiving` a metallic screw-ring, C, which has lits upper edge turned inward at e to form atlange,which will receive under it an annular flange, s, upon the the rim of cover B, and allow this cover tobe forcibly drawn down and confined in place by `means of said screw-ring.

Fig. 3 is a similar view of the' rIhe jar A, which I have above described, is constructed in a similar'manner to ythe jar for which Letters Patent ofthe United States were granted to me on the 28d day of February, A. D. 1869; and I do not therefore claim under this petition such jar.

VMy improvement consists in constructing an- Anularsteps or angular ribs g gupon the interior surface ofthe rim of the cover B,which cover ispreferably made of glass or other vitreous substance. 'These steps or ribs gpresent angular edges, vand they increase in diameter from the closed to the open end of ther cover,.so that when the latter is put upon a jar, A, and forcedv down by the screw-ring C or its equivalent,v each one of the steps or ribs will embed itself 1 into the upwardly-tapering surface of the gasket J, as shown in Fig. 3, and each rib will assist in producing atight joint by compressing the gasket downwardly and inwardly. In my Letters Patent numbered 87,274 the 4jar which I therein claimed was sealed bythe compression of a rubber gasket between the rib d and shoulder c, the rubber swelling outwardly beneath `the lower edge of the rim of the cover during the act of forcing the cover down in place. I now produce tight joints be-V tween the stepped surfaces g and the rib d at y points above the horizontal shoulder b, and upon the exterior of the jar, and employ the shoulder chieiy to prevent the gasket from slipping down while applying the cover.

Having described my invention, what I claim as new, and desire to secure by LettersV Patent, is'- l. A cover or cap, B, having parallel annular stepped surfaces or ribs formed upon the inner surface of its rim, adapted for a preserve-jar, constructed substantially as de-l scribed. v

2. The combination of the cover having par-A allel annular stepped surfaces g g, with the screw-ring C, gasket, and jar, substantially as and for the purpose described.

f Witness my hand in the matter ofk my ap- A plication for Letters Patent for an improved preservejar. y

JOHN L. MASON.

Vitnesses:

JULrUs HrEscH, R. T. CAMPBELL. 

